One of the things which led me to consider that there was a relationship between the allocation of planetary joys and the allocation of planetary sect, was the doctrine of Paulus Alexandrianus (350 AD) that the joys of Saturn and Mars were dependant upon the chart being diurnal or nocturnal-Paulus teaches that Saturn's joy is the 12th house IF (and only if) it is a day chart, and that Mar's joy is the 6th house IF it is a night chart. This teaching started me thinking that there was a connection between the allocation of joys and sect.
Elementally considered, with the Saturn 12th/Jupiter 11th/Sun 9th joys, we have the elements Earth, Air and Fire as diurnal-how can Earth be considered as resonant with day, light and warmth? With the Manilius joys we have Jupiter/Venus/Sun-Air, Water and Fire, and with the Manilius joys connected with night we find Moon, Saturn and Mars-Water, EARTH and Fire (with the other system the night has an elemental imbalance-2 Water elements-Moon + Venus-plus Fire) Earth (Saturn) seems more resonant with coolness and darkness (night) than with daylight and warmth.
With the Manilius joys we find the 2 benefics by day (Venus and Jupiter), the 2 "malefics" by night (Saturn and Mars) Looking at the houses of sorrow (the opposite of the allocated houses of joy) can give some insight: with the generally accepted schema (since the time of Valens and perhaps earlier) Venus house of sorrow would be the 11th, and Jupiter's house of sorrow would be the 5th: the 11th is the house of joy of the greater benefic Jupiter-how could it be the house of sorrow for another benefic, the lesser benefic Venus? The 6th house would be the house of sorrow for Saturn, and the 12th house the house of sorrow for Mars-how could houses which are resonant to one malefic be dissonant to another malefic?
In the Manilius (and, as I believe, the earlier Hellenist) schema, with Saturn in the 4th and Venus in the 10th, we can easily see why the opposite houses would be the sorrow of each planet: here, Saturn sorrows in the 10th, which (here) is the house resonant with the benefic Venus; and Venus sorrows in the 4th, which (here in the Manilius schema) is the house resonant with the malefic Saturn. The relationships of houses of joy vs houses of sorrow, is another reason that the Manilius schema of planetary joys makes more sense to me (than what I consider to be the later planetary joy/sorrow schema which dominated Hellenist practice possibly from the beginning of the 2nd century AD)
(NOTE: I am NOT trying to advocate Manilius or convince anyone of anything regarding the historical doctrines allocating planetary joys or the sect of planets-actually I consider planetary joys and sect only minor considerations in delineation
Just explaining my reasons for the outlook I have regarding these issues)